  import { mapGetters } from 'vuex';
  
  export default {
    computed:{
      ...mapGetters('m_cart',['total'])
    },
    watch: {
       total () {
          this.setBadge()
       }
    },
    onShow () {
       this.setBadge();
    },
    methods:{
       setBadge () {
         uni.setTabBarBadge({
            index:2,
            text: this.total + ''
         })
       }
    }
  }